| 摘要 |
<p>PURPOSE:To stably pull in a phase controlling loop at the moment when the mode is switched from special reproduction to normal reproduction and to suppress the disturbance of a picture by making the phase of a reference signal for controlling the phase of a disk follow the phase of a phase feeding back signal. CONSTITUTION:A vertical synchronizing signal from a terminal 1 is not impressed upon a reference generator 2 at the time of reproduction and the generator 2 sends a reference signal to an automatic phase controlling (APC) circuit 3 under a freely run condition. A (PG) signal indicating the position of a head generated from a coil 5 by the rotation of a motor 4 is fed back to the APC circuit 3 as a comparison signal and a phase feedback (PFS) signal indicating the rotational phase of the head is outputted to a phase adjusting means 10. Moreover, a control signal for adjusting phase is inputted in the reference generator 2 through a switch 11 which is conducted at the time of special reproduction and the phase of the reference signal REF is made to follow the PFS signal. Therefore, pulling in of a phase controlling loop can be performed stably when the mode is switched from the special reproduction to the normal reproduction.</p> |
